1211201100120 has 128 divisors (see below), whose sum is σ = 4023094314240. Its totient is φ = 289242032640.

The previous prime is 1211201100107. The next prime is 1211201100121. The reversal of 1211201100120 is 210011021121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1211201100096 and 1211201100105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211201100121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6759147 + ... + 6936026.

It is an arithmetic number, because the mean of its divisors is an integer number (31430424330).

Almost surely, 2^{1211201100120} is an apocalyptic number.

1211201100120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211201100120 is an abundant number, since it is smaller than the sum of its proper divisors (2811893214120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211201100120 is a wasteful number, since it uses less digits than its factorization.

1211201100120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13695265 (or 13695261 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1211201100120 its reverse (210011021121), we get a palindrome (1421212121241).

The spelling of 1211201100120 in words is "one trillion, two hundred eleven billion, two hundred one million, one hundred thousand, one hundred twenty".